Oxford Discover Workbook 5 Answer Key Unit 9 Apr 2026

"We can’t rely on power," Leo said. "What about bells? Church bells, school bells — loud and simple."

That morning, Ms. Kim had given them a challenge: Design a low-cost early warning system for a community with no internet or sirens. oxford discover workbook 5 answer key unit 9

They sketched a plan: a network of volunteers with whistles, hand-crank radios, and brightly colored signs. Red for "drop, cover, hold on." Yellow for "evacuate to high ground." "We can’t rely on power," Leo said

Most of Maya’s classmates drew complex machines with flashing lights and drones. But Maya and Leo decided to think differently. Kim had given them a challenge: Design a

Two weeks later, during a drill, Maya and Leo’s system worked perfectly. Their classmates spread out, whistles blew, red signs went up. Everyone knew exactly what to do.

"But not everyone hears bells," Maya replied. She remembered the workbook reading passage about a village in Japan that used drums and colored flags.